Mat for an infant



FIG. 1 is a top plan view of mat for an infant showing our new design;

FIG. 2 is a bottom plan view thereof; and,

FIG. 3 is a top perspective view thereof.

The broken lines in the drawing depict portions of the mat for an infant that form no part of the claimed design. 

CLAIM The ornamental design for a mat for an infant, as shown and described. 